Yuma, Arizona, in the early 1880s. When U.S. Marshal Dale Posey needs help bringing notorious outlaw Tom Spooner to justice, he turns to the one man he knows who can deliver: the former leader of Spooner's gang, a man now serving a lengthy sentence at Yuma Prison, Jack Posey, Dale's younger brother. Dale has a deal for Jack: a full pardon if Jack helps Dale capture Spooner and his gang. Jack doesn't exactly jump at the deal, but he does accept it, partially because it offers him a chance to settle an old score with Spooner, his former second-in-command. Structurally resembling a police procedural leads followed, sources interviewed, etc.